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The Western Australian Herbarium’s collections management system and census were set to read-only mode on 1 October 2025. Taxonomic updates published since this time are not being reflected in Florabase, herbarium collections, or Western Australia’s taxonomic names census (Nomos). Conservation listings displayed on Florabase may also be out of date. Please refer to DBCA’s Threatened species and communities webpage for the most recent Threatened and Priority Flora List, noting that recent taxonomic updates are similarly not included. Our database migration is moving to a staging phase. We thank you for your patience as we ensure the integrity of our biodiversity data, develop new workflows, and train staff to use the new systems. Please reach out to us if you have any questions or concerns.

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Hypoglossum barbatum Okamura

Reference
Ill.Mar.Algae Japan 19, Pl. VII (1901)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus with prostrate and erect leaf-like branches to 2 cm long, attached by a primary holdfast and at several points by clustered rhizoids arising from the blade margins. Branching up to 3 orders; branches arising from the midline, on one surface, alternately or unilaterally every 9–11 axial cells but with occasional intercalation of secondary branches. Additional branches arising from the basal segment of parent axes, giving the appearance of subopposite branches. Blades linear-lanceolate, to 1.5 mm wide, with attenuate apices. Structure with all cells of second-order rows bearing third-order rows.

Reproduction. Spermatangia in discrete sori on both sides of the midline, often from individual cells of alae, occasionally becoming confluent. Tetrasporangia spherical, tetrahedrally divided, 60–70 µm diam., in elongate sori over the midline, the lateral pericentral cells involved in sporangial production.

Distribution. This species is possibly widespread in tropical seas.

[After J.M. Huisman & S.-M. Lin in Algae of Australia: Marine Benthic Algae of North-western Australia, 2. Red Algae: 462 (2018)]